You can spot a liar if the liar slips up, but you're not always aware of other people's dishonesty.
Eventually a liar will reveal himself, and you usually will figure out if you've been lied to.
However, someone could be duping you without you knowing it. So watch out for the telltale signs of lying!

I can definitely spot the liar. I actually do have a really good instinct for when people are being dishonest but I don't consciously look for the signs listed in the quiz. I just get a kind of a gut feeling that is most likely based on physical signs, and I'm almost always right. My kids HATED that when they were teenagers!